UH-60A External Stores Support System Fixed Provision Fairings Drag Determination

摘要

A comparative performance evaluation of the UH-60A helicopter in the normal utility configuration and with the External Stores Support System (ESSS) fixed provision fairings configuration (ESSS wings removed) was conducted at Edwards AFB, Cal. A total of eight flights were flown between 30 August and 22 September 1983 for a total of 10.0 productive hours. The increase in equivalent flat plate area due to installation of the ESSS fixed provision fairings was 2.5 sq. ft. With the ESSS fixed provision fairings installed at the out-of-ground effect hover guarantee conditions of 95 percent intermediate rated power at 4700 feet pressure altitude on a 35 deg C day, the hover capability was reduced 466 pounds. Incorporating the weight of the airframe fixed provisions will reduce the payload by 596.6 pounds or the equivalent of eliminating two combat equipped troops and 117 pounds of fuel or equipment. (Author)